Add “Next” and “Previous” links in date headers

Add “Next” and “Previous” links in date headers that go to the next or previous tag “sibling” (so When/2018 would link to When/2019 and When/2017).

Additionally, it would be great to lazy-load the next (or previous) sibling, so clicking a link between them wouldn’t even be necessary (credit for this idea goes to mrm himself!).

I want to bump this since there are more people active in the forum these days. What does everybody think about this feature request?

While I love using the streams to browse my photos, I find it very clunky to have to use the back button to go out of the current month, then click on the next month to continue browsing.